Seadrill’s constant strive to achieve their goal in setting the standard in drilling pursues the focus on operations excellence. The company’s fleet is expanding with frequent new Mobile Offshore Drilling Units (MODU) and this might involve challenges with keeping up operations excellence from the first day. In this thesis the main object is to perform operation efficiency analyzes across three of Seadrill’s semisubmersible rigs; West Venture, West Phoenix and West Eminence. The chosen operations for analyses are: · Unrestricted tripping of drillpipe in cased hole · Unrestricted running of casing into the well · Running and pulling BOP The analyses were based on Daily Operations Database Application (DODA) reports, which is Seadrill’s daily operation reporting system. The reports contain specified amount of hours spent to perform the operation and the tripping distance, and tripping rates were determined and compared with the rigs. In the BOP operations the analyses emphasizes in addition on operation efficiency when placing BOP on wellhead and unlatch BOP from wellhead including the related operations. The well data are based on exploration wells, except from the first analysis which contain operations from other wells.

Master's thesis in Petroleum engineering